St. Thomas Aquinas quotes on women.
Women are made to be mothers:
"It was necessary that woman be made, as Scripture says, as a helpmate to the male; not indeed as a helpmate in some other work, as some have said, since in any other work a male can be more conveniently helped by another male than by woman; but as a helper in generation."
Reference: ST 1.92.1c
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Men have a superior understanding:
"But man is ordered to a still nobler vital operation, and this is to understand. And, thus, in man there is a greater reason why there should be a distinction of the two powers, so that the female be produced separately from the male, although they carnally unite for the work of generation."
Reference: ST 1.92.1c
"And thus woman is naturally subject to the man according to such a subjection because in man the discretion of reason is naturally more abundant."
Reference: ST 1.92.1 ad 2
"According to this, since woman has a weak complexion with regard to the body, it happens that for the most part she is weakly attached to that to which she is attached... Now since those things which are small or weak 'are reckoned as nothing' it is thus that the Philosopher speaks of women as not having a firm judgment of reason, although in some women the contrary occurs. And on account of this he states that we do not say that women are continent because they 'do not lead,' meaning that they do not have solid reasoning, 'but are led,' meaning that they easily follow their passions."
Reference: ST II-II.156.1 ad 1
"Subjection is twofold. One is servile (servilis), according to which a superior (praesidens) uses a subject for his own utility... Yet there is another, [namely] domestic (economica) or civil subjection, according to which a superior uses his subjects for their own utility and good... Thus by such a subjection the woman is naturally subject to the man because in the man the discretion of reason is more abundant." Reference: ST 1.92.1 ad 2
Men are not just physically, but mentally stronger:
"The woman submits to the man on account of the weakness (imbecillitas) of [her] nature with regard to vigor of mind (vigorem animi) and with regard to strength of body (robur corporis)." Reference: In IV Sent. d. 44, q. 1, a. 3, qc. 3, ad 2
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Women tend to be lead by their emotions (What a shocker! - who would have guessed! :) ) :
"He offers the example of women in whom, for the most part, reason is not vigorous on account of the imperfection of their corporeal nature. And thus for the most part they do not lead their affections according to reason, but rather are lead by their affections. For this reason wise and brave women are rarely found. Thus they cannot be said to be continent or incontinent simply speaking." Reference: Sententia libri Ethicorum (In VII Eth.), lect. 5, n. 9
Women can be fickle (NEVER!!):
"Since woman is free, she has the power of being counseled, but her counsel is powerless. The reason for this is that due to the gentleness (mollitiem) of her nature her reason does not firmly adhere to her counsel, but is quickly removed therefrom on account of passions, such as concupiscence, or wrath, or fear, or things of the sort." Reference: In I Pol., lect. 10, n. 9
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Women are made for man:
"But with respect to something secondary the image of God is found in the man in a way that it is not found in the woman, for the man is the principle (principium) and end of the woman, just as God is the principle and end of every creature."
Reference: ST 1.93.4 ad 1
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Other considerations:
"Testimony is rendered inefficacious by whatever brings probability to the contrary. Now probability [to the contrary] is rendered by the fact that someone is not firm in testifying concerning the truth... This can be either from a defect of reason as is evident in the case of children, the demented, and women..."
Reference: ST II-II.70.3c
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None of the above means women should be despised though:
"The masculine sex is nobler than the feminine and thus [Christ] assumed human nature in the masculine sex. Yet lest the feminine sex be despised it was fitting that He should assume flesh from a woman."
Reference: ST III.31.4 ad 1
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Marriage is not slavery for a woman:
"It manifestly appears to be inappropriate if a woman can be put away by her husband: because a woman is naturally subject to a man as to her governor; and it is not within the power of him who is subject to another to depart from his rule. It would be, therefore, against the natural order if a woman were able to abandon her husband. Therefore if a husband were permitted to abandon his wife the society of husband and wife would not be even (non esset aequa societas), but would be instead a sort of slavery on the part of the wife." Reference: SCG 3.123, n. 4